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/ˈɹiː.ə.stat/ · noun
(electronics, technology) An electrical resistor, with two terminals, whose resistance is continuously variable by moving a knob or slider..
Use rheostat when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Rheostat means (electronics, technology) An electrical resistor, with two terminals, whose resistance is continuously variable by moving a knob or slider..
Common synonyms include variable resistor.
The opposite depends on the specific sense.
Use rheostat where its definition matches the intended context.
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